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公开(公告)号：US2659072A
公开(公告)日：1953-11-10
申请号：US7076449
申请日：1949-01-13
Applicant: COALES JOHN F , SIDNEY ELLIOTT WILLIAM , DOUGLAS HILL NORMAN , EDWIN HERSOM SAMUEL , JOHN TINDALE
Inventor： COALES JOHN F , SIDNEY ELLIOTT WILLIAM , DOUGLAS HILL NORMAN , EDWIN HERSOM SAMUEL , JOHN TINDALE
IPC: H03M1/00
CPC classification number: H03M1/308
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